109 citations · 409 across the 21 of their papers we have counts for
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Slow-roll approximation in quantum cosmology
Oliver Janssen
In minimally coupled scalar field theories with a potential of the slow-roll type, we give a detailed description of the complex -symmetric solutions to Einstein's equations…
The no-boundary proposal in biaxial Bianchi IX minisuperspace
Oliver Janssen, Jonathan J. Halliwell, Thomas Hertog
We implement the no-boundary proposal for the wave function of the universe in an exactly solvable Bianchi IX minisuperspace model with two scale factors. We extend our earlier wor…
Damped perturbations in the no-boundary state
Juan Diaz Dorronsoro, Jonathan J. Halliwell, James B. Hartle +3
We evaluate the no-boundary path integral exactly in a Bianchi IX minisuperspace with two scale factors. In this model the no-boundary proposal can be implemented by requiring one…
The Real No-Boundary Wave Function in Lorentzian Quantum Cosmology
Juan Diaz Dorronsoro, Jonathan J. Halliwell, James B. Hartle +2
It is shown that the standard no-boundary wave function has a natural expression in terms of a Lorentzian path integral with its contour defined by Picard-Lefschetz theory. The wav…